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Nuttso One of the first things I install. Molly is a super lean signal that offers compartmentalization by default.
I've used pretty much every popular fork of signal, with various numbers and various phones. Molly offers the lowest background battery drain of any option available. It also can be lowered even more by enabling the encrypted protection option, which prevents any notifications and the like from coming in until you unlock it. I'm super anal about idle-drain. So this is a huge plus and weight in my own rankings.
I personally have it set to an autolock of 3H (without a device unlock) and it sorta manages itself. Honestly thinking about cutting it even shorter. Combo'd with KPDX, unlocking it is a breeze.